Sadlymost of the people feel drawn to many paths suchaas wicca in search of more power. Most of them hope to find something paranormal. The presentation of the media doesn't really help.
Wicca is not about magick. It has ofcourse a touch of rituals and spells but this is not the main thing. Wicca is a lifestyle, a way of thinking and a combination of beliefs and philosophy.
Explain him that and if he wishes to continue teach him about the wiccan beliefs sabbats and philosophy without the practice part (spells rituals) at first.
If he is been respectful and patient introduce him to the practice as well
I would recommend small steps at a time.
Good luck and